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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen QEMU Shared Ring Processing Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1037344
SecurityTracker URL:  http://securitytracker.com/id/1037344
CVE Reference:   CVE-2016-9381   (Links to External Site)
Date:  Nov 25 2016
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.4.x, 4.5.x, 4.6.x, 4.7.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system.

A local administrative user on the guest system can trigger a double-fetch memory error on the shared ring to potentially execute arbitrary code with QEMU privileges.

On systems that do not use a device model stub domain, the local administrative user on the guest domain can obtain host system privileges.

x86 HVM guests are affected.

ARM systems are not affected.

yanghongke of Huawei Security Test Team reported this vulnerability.

Impact:   A local user on the guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix.

The vendor advisory is available at:

http://xenbits.xen.org/xsa/advisory-197.html

Vendor URL:  xenbits.xen.org/xsa/advisory-197.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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